Effect of electrical-discharging on formation of nanoporous biocompatible layer on titanium
| Autor: | Yung-Ning Pan, Chau Hsiang Wang, Pei Wen Peng, Keng Liang Ou, Hsi Chen Lin |
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| Rok vydání: | 2010 |
| Předmět: |
Nanostructure
Materials science Nanoporous Mechanical Engineering Alloy Metals and Alloys Oxide Titanium alloy chemistry.chemical_element Nanotechnology engineering.material Microstructure chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Materials Chemistry engineering Layer (electronics) Titanium |
| Zdroj: | Journal of Alloys and Compounds. 492:625-630 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2009.11.197 |
| Popis: | In this study, we performed an electrical discharge machining (EDM), by which a recast layer was formed on a titanium surface. Subsequently, an α-phase and a γ-TiH-(γ-hydride)-phase were formed on the recast layer by electrical-discharging. Nano-(δ + γ) hydrides play important roles in the formation of nanostructural oxide layers. Electrical-discharging not only generates a nanostructural recast layer but also converts the alloy surface into a nanostructured oxide surface, which increases the alloy biocompatibility. A γ-hydride microstructure was also formed on the recast layer following electrical-discharging. The microstructure had a tetragonal structure with lattice constant a = 0.421 nm. In the recast layer, a transition, α → (α + δ) → (δ + γ) → γ, occurred during electrical-discharging. This result has never been previously reported. The recast layer that contains nanophases was dissolved during electrical-discharging; by this process, electrical-discharging for a short duration yields nanoporous TiO2. Hence, electric discharging for a short duration leads to the production of nanostructures as well as bioactive titanium. |
| Databáze: | OpenAIRE |
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